A practical guide for solidity developers — What is EVM? You might have heard of Java Virtual Machine, where developers code in Java (or other languages) that compiles down to Java bytecode and JVM is a runtime engine that executes Java bytecode. …

If you want to skip directly on how to implement Uniswap airdrop, proceed to the section: Steps on creating a Merkle Airdrop An airdrop is an event when the project decides to give tokens away to a group of users. These are some potential way to implement airdrop: Admin call…

NFT stands for non-fungible token, it can represent ownership for a digital asset. NFT can take the form of an in-game item for GameFi (play-to-earn application), or a digital art piece, or even as PFP like CryptoPunks. What is CryptoPunks or Pudgy Penguins If you have chanced into this blog post, chances are you know what…

Rugpull where developers exit-scam or exploits where hackers abuse a bug in the smart contract for their economic benefit is some of the most commonly heard terms in the defi space. But, did you know that approving a project’s smart contract is as good as giving the password to your safe and allow the project to take funds from your safe whenever they want? What does smart contract token approval mean?

Background Pivot table is one of the most commonly used features in Excel for reporting purposes. The user does not need a programming background to perform data analysis. +---------------+-------+---------------+--------------+ | Item Category | Price | Region | Sales Person | +---------------+-------+---------------+--------------+ | Furniture…

When an EC2 instance sends data to s3, the traffic by default will route through the internet. There might be security (or regulatory) concerns as traffic leaves the VPC. Or the obvious issue with the above approach is the additional cost involved. When traffic route through the internet, there will…

Bitcoin has went from the high of close to 20k USD in 2017, to a low of 3156 USD in 2018 and currently stand over 10k as of 2019 June. And with Facebook’s recent announcement of Libra, cryptocurrency is here to stay. …

Tweaking Spark configuration for beginner might be a daunting task as the required knowledge ranges from understanding what does spark driver and executor do to determining the resource needs of them. Tip 1: Cache and cache The easiest way to improve performance is to identify places to .cache. …

Have you ever experience reading an existing React code base and wondering why is there a need for this.functionName = this.functionName.bind(this) in the React component constructor? And what make it more confusing is when not all function has binding syntax. If you looking for a quick-fix this problem, one…